. >> kevin collins disappeared almost 29 years ago. he was last seen at a bus stop in san francisco. abc7 news reporter is here with what this new information means to the investigation. sergio? >> abc7 news has learned the main person of interest in the disappearance of 10-year-old kevin collins had a wrap sheet and it included kidnapping. abc news was the first on the scene when police took jackhammers into this home. our source tells us that is where dan therion lived. he also went by the name of kelly. he was questioned by police six days after kevin collins disappeared. investigators never searched his backyard or basement at the time. cold case investigators returned to the home this week and tore up the basement floor looking for evidence that might link him to the young boy. the home is right across the street from kevin's old school. our sources say therion had a dog. earlier this week the lead investigator in this cold case told abc7 reporter vic lee a key detail of what two witnesses saw way back in 1984 jie. we had another